2 wrote:
>
>
>>While rooting around inside the SB-1000, I checked the carbon resistor
>>in the paralytic choke... good as new.
>>
>** What was the measured resistance? // I have found that intermittent
>vhf parasites are so brief they can damage the element of a carbon-comp
>resistor without exhibiting damage to the moulded case. Thus, a
>new-appearing carbon-comp resistor can have several times more ohms than
>its specified value.
>
I'm aware of that, so I unsoldered the resistor and measured the
value... good as new.
>>The RF choke and bypass caps were there as standard. Since the screwy
>>meter readings were only on one band (the lowest) I put it down to RF
>>rectification rather than purely threshold voltage.
>>
>** In your opinion, is 88-ohms of XC an acceptable bypass for c. 1A-rms
>of RF current?
>...
There are thousands of amps, of many different kinds, that seem to work
fine with 0.001uF. That evidence has a large influence on my opinion.
--
73 from Ian G3SEK Editor, 'The VHF/UHF DX Book'
'In Practice' columnist for RadCom (RSGB)
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